Adjustable drill-support.



PATENTED JUNE 18, 1907.

A. MGHRBACHER. ADJUSTABLE DRILLSUPPORT.

APPLIUATION FILED AUG. 2B, 1906.

An ULPH MUHRBAB /A/VE/vroH HER ATTORNEYS between two opposite Walls.

UNITED STATES PATENT4 OFFICE.-

ADOLPH MOHRBAOHER, OF CRIPPLE CREEK, COLORADO.

ADJUSTABLE DRILL-SUPPORT.

.Application filed August 28,1906.

To a/ZZ whom, t may concern: v-inBe it known that I, ADOLPH MOHRBAGHER,a citizen of the United States, and a resident of Cripple Creek, in thecounty of .Teller and State of Colorado, have made certain new anduseful Improvements in Adjustable Drill- Supports, of which thefollowing is a specification.

My invention is an improvement in drills and relates particularly to themeans for sup porting what are commonly known as hand machine airdrills; and 'the invention consists in certain novel constructions andcombinations of parts as will be hereinafter described and claimed.

In the drawing, Figure l is a side elevation of a support embodying myinvention held Fig. 2 is a vertical longitudinal section ofthe supportin connection with anair drill, the latter eX- tending between thesupport and the upper wall. Fig. 3 is a cross section on about line 3 3of Fig. 2. Fig. 4 is a crossl section on about line 4-4 of Fig. 2, andFig. 5 shows a different form of point from that illustrated in Fig. 2.

My invention seeks to provide in connection with an adjustable oreXtensible cross bar, a support for the stopping bar of an air drill,such for instance as the Iler, Ingersoll Jap, Murphy, Hartsock, ShawEclipse, and similar well known machines that are made with self-airfeeding stoping bars, the machines being operated by compressed air asis well understood by those skilled in the art.

In the drawing I represent at A an Iler air machine, in which the airpipe A leads to a cylinder A2 and the stoping bar A3 works in thecylinder A2 and is formed at its lower end to fit in any desired one ofa series of sockets B formed in the adjustable sleeve B presentlydescribed. f

The extension cross bar comprises the outer or tubular section C and theinner or bolt section D, the latter being threaded in the section C andpointed at one end D and r'ovided near such end with openings D2 formingsockets for a jack bar whereby the threaded section D may be turned toadjust the length of the sectional cross bar. At its .outer end, thetube O is provided witha threaded bearing for the screw stem E of thepoint E, such threaded bearing being preferably provided in a separatesleeve E2 and iitted and secured Within the end of the tube O as shownin Fig. 2. The point E may be as Specification of Letters Patent.

Patented June 18, 1907.

Serial No. 332,346.

shown in Fig. 2, orit may be preferred in some instances to .use adifferent form of point such as shown at e in Fig. 5. At its endopposite the sleeve E2, the tube O is provided With a threaded bearingfor the bolt D, such threaded bearing being formed in a separatev sleeveF suitably threaded and iitted and secured within the end of the tube Cas shown in Fig. 2. l

The bolt D is threaded to iit thesleeve F, and is pro vided at its innerend with a slide G iitting within the tube C and operating to steady themovement of the inner end of the boltD Within the tube O, as will beunderstood from Fig. 2, and also to form a stop, which, by contact withsleeve F, prevents the bolt D from being drawn out of tube C. This slideG is preferably in the form of a collar screwed on a screw stem g at theinner end of the bolt D so it can be applied after the bolt has beenscrewed through its sleeve F. Thus in applying the parts, it will be understood that the sleeve F may be fitted within the tube O at one end,the bolt D be screwed into said sleeve F and project at its inner endwithin the tube C, the slide G be then applied, and the sleeve E2finally applied to receive the point E or e as will be understood fromFig. 2.

' The sleeve B is fitted over the tube of the extension bar, beingprovided at one end with an inwardly projecting flange B2 to fit andslide along the bolt D and thus steady and brace such end of the sleeveB as best shown in Fig. 2. This sleeve it will be noticed is movablealong the extension bar in a longitudinal direction, and also may beturned on said bar, and means are provided for securing the sleeve inany desired longitudinal or rotary adjustment upon the cross bar. Thismay be simply a clamping screw II as shown, or it may be any othersuitable form of clamp. The screw II is preferred because of itssimplicity and the ease with which it may be operated to secure andrelease the sleeve.

IOO

By my invention it will be noticed the air v IIO receiving the lower endof the self-feeding n stoping bar as will be understood from Fig.

2. .The sockets, it will be noticed, form seats for the stoping barwhich may be simply dropped at its lower end into any desired socket andthe air be supplied to operate the drill and to also secure theself-feeding by the action of the air in the cylinder A2 upon thestoping bar as is well known by those skilled in the art. It will benoticed therefore that my invention provides a support for air machinedrills, operated by self-feed ing stoping bars, and that the drill Ashown is one form of many such drills now in use.

The support may be made. in different sizes to suit different demands,and` when operated will result in the saving of much time and labor bypermitting the convenient setting up of the machine without requiringTthe cutting of hitches, and dispensing` with the use of wedges, etc., asare commonly used providing supports for drills of the characterdescribed. It will be understood. that in practice, the extension crossbars may be manufactured and sold to those using such drills.

It will be understood that the sleeve or jacket B is an importantfeature of my invention, as it provides in connection with a cross baran adjustable support providing a seat for the stoping bar as beforedescribed.

l claim:

l. An extension cross bar consisting of a tubular section,sleevesthreaded internally and fitted and held within the opposite endsofthe said tube, a point having a screw stem threaded into one of saidsleeves, and a bolt section threaded into the other sleeve and having atits inner end a screw stem and a collar thereon and forming a slidefitting within the tubular section, said bolt having a pointat its outerend, and an adjustable sleeve or jacket lit-ting on and movablelongitudinally and rotarily upon the tube of the cross bar, and having`at one end an inwardly projecting flange tting and slidable along thethreaded bolt, the said sleeve or jacket being provided with a socket orsockets to receive the end of a stoping bar, and means for securing thesaid sleeve or jacket in any desired adjustment, substantially as setforth.

2. A cross bar having a tubular section and a bolt or threaded sectionscrewing into the tubular section, and a sleevel or jacket adjustableupon the tubular section and projecting at one end over the bolt sectionand having at said end an inwardly projecting flange to slide upon thebolt section, and steady such end of the sleeve or jacket, the latterhaving a seat or seats lor a stoping bar, substantially as set forth.

ADOLPH MOHRBACHER.

Witnesses z ERNEST L. HUMPnREYs, MARvEN O. BERRY.

